AiO (10.15.0): Almost no space left on disk - how freeing some space?

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You’re right that there are many large images on your system, and based on your list, a good example of a duplicate would be:

nextcloud/aio-collabora   latest   21a697112d03   2 months ago   1.43GB

Since the same component now exists under ghcr.io/nextcloud-releases/aio-collabora, this older image is almost certainly unused and safe to delete.

Regarding Portainer:

It’s a common misconception, but Portainer does not require images or containers to be created from within Portainer itself. Once installed, it connects directly to the Docker socket (/var/run/docker.sock) and provides full control over all:

  • Images
  • Containers
  • Volumes
  • Networks
    — regardless of how they were created (CLI, docker-compose, or other tools like AIO).

:light_bulb: Personal note:
In my case, I never use Portainer Stacks. I always deploy my containers via docker-compose.yml from the CLI.
Why? Because I’ve had multiple cases where configurations inside Portainer Stacks simply vanished after a Portainer update.
Since then, I use Portainer only as a management dashboard — and it works great for that.

:white_check_mark: Suggested cleanup process:

  1. Delete the nextcloud/aio-collabora image manually using:

    docker rmi 21a697112d03

    That will free up ~1.43 GB.

  2. Install Portainer, which pulls an image around 420 MB — so you’ll have enough space after removing Collabora:

    docker run -d \
  -p 9000:9000 \
  -p 9443:9443 \
  --name portainer \
  --restart always \
  -v /var/run/docker.sock:/var/run/docker.sock \
  -v portainer_data:/data \
  portainer/portainer-ce

  3. Open Portainer in your browser (usually at http://<your-ip>:9000) and:

    • Go to Images
    • Use the “Unused” filter
    • Safely delete all remaining duplicates or old images

That way, you’ll recover disk space while having full control and no risk of deleting something essential.

Note: This post was written with the help of an AI assistant as a writing aid only. The opinions, solutions, and technical recommendations are fully based on my personal experience.
More about how and why I use AI to write forum posts:
:right_arrow: Is there limitations to installing Nextcloud via CT template on Proxmox - #4 by vawaver

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